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Common Sample Preservation Techniques for Laboratory Water
The table lists the requirements for water sample preservation techniques. The preservation time, container material selection, and application of preservation measures all depend on the components and properties of the sample. However, real-world water samples vary greatly; therefore, the requirements listed in the table are not absolute guidelines. Each analyst should verify the applicability of these requirements in their specific work, and the methods for sample collection and preservation should be clearly specified when developing analytical method standards.
Furthermore, if there are incompatibilities between the analytical method to be used and the protective agent and container material, it is often necessary to take several samples from the same water body and analyze them using different preservation methods to determine the most suitable protection method and container.
Common Sample Preservation Techniques – Table 11
(This table only contains general requirements for sample preservation. Due to the complex properties of natural water and wastewater, the stability of each type of sample treated according to the following methods needs to be verified before analysis.)
1 Project to be tested | 2 Container Category | 3 Save method | 4 Analysis location | 5 Storage time | 6 suggestion |
D put shoot study point Analysis | P or G | Numerous studies on sample preservation methods for radioactive analysis have shown that it is impossible to find a universally applicable method. The method must be tailored to the type of analysis (measuring total radioactivity (α, β, γ) or the radioactivity of one or more radionuclides). The main challenges in preserving these samples lie in the container walls, the adsorption of suspended matter within the sample, and the shelf life of the radionuclides. Therefore, container selection is crucial, and desorption treatment may be necessary. Commonly used preservation methods can be used individually or in combination. These include acidifying the sample with HNO3 to pH < 2, freezing to -20°C, or adding a stabilizer. | laboratory | Depends on radioactivity Nuclide half life |
Note: ① P – Polyethylene; C – Borosilicate glass. ② A "-" indicates that no preservation measures are taken.
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